Jean Rhys‟s best-known postcolonial novel Wide Sargasso Sea has always been regarded as a prequel to Charlotte Bronte‟s Jane Eyre by shifting the focus from Jane to “the mad woman in the attic.” It is a novel filled with tragedy and it inquires into the production of knowledge about racial identity tragedy, especially the white Creole women‟s identity tragedy. The paper attempts to provide a comprehensive view of the “mad woman” Antoinette, who was caught between the control of English imperialist and racial class tension in Wide Sargasso Sea and try to prove that Antoinette‟s identity tragedy is the result of “being voiceless.”